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Main Features
· Compact and lightweight: Much smaller in size and lighter in weight than gate valves or globe valves of the same diameter, with easy installation.
· Quick and labor-saving operation: Only a 90° rotation is required to fully open or close, enabling fast and simple operation.
· Low flow resistance and energy saving: The flow passage is unobstructed in full open position, resulting in low flow resistance and low pressure loss.
· High economy for large diameters: Particularly suitable for large-diameter pipelines (above DN80) with significant cost advantages.
· Dual regulation and shut‑off functions: Flow can be adjusted by controlling the opening degree, and soft-seal types can also be used for low-pressure shut‑off.
■ Technical Specifications
| Parameter Category | Specific Parameters | Unit / Description | Typical Range / Significance |
| Basic Specification | Nominal Diameter (DN) | mm | DN50 ~ DN3000+ (outstanding advantages in large diameters) |
| Nominal Pressure (PN) | MPa | PN0.6 ~ PN2.5 (standard), high-pressure models up to PN6.3 ~ PN10.0 | |
| Connection Type | - | Wafer type, flanged type, lug type, welded type | |
| Structural Performance | Structure Type | - | Concentric, single-eccentric, double-eccentric, triple-eccentric (performance improved in sequence) |
| Valve Body Material | - | Cast iron, ductile iron, carbon steel, stainless steel (304/316), aluminum alloy, plastic | |
| Seat / Sealing Material | - | Rubber (EPDM/NBR), PTFE, stainless steel with graphite, metal hard seal | |
| Flow Coefficient (Kv) | m³/h | Relatively large; specific values shall be checked according to diameter and structure | |
| Leakage Class | ANSI/FCI | Soft seal up to Class VI (bubble-tight), metal seal generally Class IV or III | |
| Torque Requirement | N·m | Relatively low, but increases with diameter and pressure | |
| Application Adaptability | Applicable Temperature Range | ℃ | -30℃ ~ +200℃ (standard rubber seat), metal seal up to +600℃ |
| Suitable Medium | - | Water, air, flue gas, fuel gas, slurry, corrosive media, etc. | |
| Medium Flow Velocity Limit | m/s | Generally recommended ≤ 10 m/s to prevent excessive seal wear or vibration | |
| Operation & Actuation | Operation Mode | - | Lever, worm gear, pneumatic, electric, hydraulic actuation |
| 90° Opening & Closing Time | s | Pneumatic / electric: several seconds to tens of seconds; manual: depends on diameter | |
| Allowable Pressure Differential | MPa | Limited by structure, generally lower than gate valves and ball valves |